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播放时:倒退3秒/复读时长按:回退AB段
播放时:快进3秒/复读时长按:前进AB段
拖动:改变速度/点击:恢复正常速度1.0
点击:复读最近5秒/拖动:改变复读次数
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English in a Minute: Canary in a Coal Mine

What do small yellow birds have to do with a dark coal mine? Learn the meaning and history of this expression with Anna, Jonathan and Ashley.